a(n) = n^3 - 3n^2 + 3.

Terms

a(0) =3a(1) =1a(2) =-1a(3) =3a(4) =19a(5) =53a(6) =111a(7) =199a(8) =323a(9) =489a(10) =703a(11) =971a(12) =1299a(13) =1693a(14) =2159a(15) =2703a(16) =3331a(17) =4049a(18) =4863a(19) =5779a(20) =6803a(21) =7941a(22) =9199a(23) =10583a(24) =12099a(25) =13753a(26) =15551a(27) =17499a(28) =19603a(29) =21869